Classes/AVPlayerDemoAppDelegate.m

/*
     File: AVPlayerDemoAppDelegate.m
 Abstract: An application delegate managing the picker view controller, playback view controller, and shared navigation controller.
  Version: 1.3
 
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 */
 
#import "AVPlayerDemoAppDelegate.h"
#import "AVPlayerDemoPlaybackViewController.h"
 
#import <CoreMedia/CoreMedia.h>
#import <AVFoundation/AVFoundation.h>
 
/* Media item url and time values are saved in the app preferences. */
static NSString* const AVPlayerDemoContentURLUserDefaultsKey = @"URL";
static NSString* const AVPlayerDemoContentTimeUserDefaultsKey = @"time";
 
typedef void (^AlertViewCompletionHandler)(void);
 
@implementation AVPlayerDemoAppDelegate
 
@synthesize cachedAssetBrowser, playbackViewController;
 
- (UINavigationController*)assetBrowserControllerWithSourceType:(AssetBrowserSourceType)sourceType delegate:(id <AssetBrowserControllerDelegate>)delegate
{
    AssetBrowserController *browser = [[AssetBrowserController alloc] initWithSourceType:sourceType modalPresentation:NO];
    browser.delegate = delegate;
    
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:browser];
    [navController.navigationBar setBarStyle:UIBarStyleBlack];
    [navController.navigationBar setTranslucent:YES];
    
    return navController;
}
 
- (UITabBarController*)tabbedAssetBrowserControllerWithSourceType:(AssetBrowserSourceType)sourceType delegate:(id <AssetBrowserControllerDelegate>)delegate
{
    UITabBarController *assetTabBarController = [[UITabBarController alloc] init];
    
    NSMutableArray *assetBrowserControllers = [NSMutableArray arrayWithCapacity:0];
    
    if (sourceType & AssetBrowserSourceTypeCameraRoll) {
        [assetBrowserControllers addObject:[self assetBrowserControllerWithSourceType:AssetBrowserSourceTypeCameraRoll delegate:delegate]];
    }
    if (sourceType & AssetBrowserSourceTypeFileSharing) {
        [assetBrowserControllers addObject:[self assetBrowserControllerWithSourceType:AssetBrowserSourceTypeFileSharing delegate:delegate]];
    }
    if (sourceType & AssetBrowserSourceTypeIPodLibrary) {
        [assetBrowserControllers addObject:[self assetBrowserControllerWithSourceType:AssetBrowserSourceTypeIPodLibrary delegate:delegate]];
    }
    
    assetTabBarController.viewControllers = assetBrowserControllers;
    
    return assetTabBarController;
}
 
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
    self->tabBarController = [self tabbedAssetBrowserControllerWithSourceType:AssetBrowserSourceTypeAll delegate:self];
 
    [self->window setRootViewController:self.cachedAssetBrowser];
    [self->window addSubview:self.cachedAssetBrowser.view];
    
    NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
    // Restore saved tab bar item from the defaults system.
    // The UITabBarItem 'tag' value is used to identify the saved tab bar item.
    NSInteger tabBarItemIndex = [defaults integerForKey:AVPlayerDemoPickerViewControllerSourceTypeUserDefaultsKey];
    NSArray *viewControllers = self->tabBarController.viewControllers;
    if (tabBarItemIndex < 0)
    {
        // If saved tab bar item does not match any existing item, then default to the first item.
        self->tabBarController.selectedIndex = 0;
    }
    else
    {
        NSUInteger tempTabBarItemIndex = (NSUInteger)tabBarItemIndex;
        if (tempTabBarItemIndex > [viewControllers count])
        {
            // If saved tab bar item does not match any existing item, then default to the first item.
            self->tabBarController.selectedIndex = 0;
        }
        else
        {
            self->tabBarController.selectedIndex = tabBarItemIndex;
        }
 
    }
    
    // Add the tab bar controller's current view as a subview of the window
    [self.cachedAssetBrowser pushViewController:self->tabBarController animated:NO];
 
    [self->window makeKeyAndVisible];   
    
    // Restore saved media from the defaults system.
    NSURL* URL = [defaults URLForKey:AVPlayerDemoContentURLUserDefaultsKey];
    if (URL)
    {
        if (!self.playbackViewController)
        {
            self->playbackViewController = [[AVPlayerDemoPlaybackViewController alloc] init];
        }
        
        [self.playbackViewController setURL:URL];
        
        /* Restore saved media time value from defaults system. */
        [[self.playbackViewController player] seekToTime:CMTimeMakeWithSeconds([defaults doubleForKey:AVPlayerDemoContentTimeUserDefaultsKey], NSEC_PER_SEC)]; 
        
        [self.cachedAssetBrowser pushViewController:self.playbackViewController animated:NO];
    }
    
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:NULL];
    
    return YES;
}
 
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
    if (self.playbackViewController && ![self.playbackViewController URL])
    {
        self.playbackViewController = nil;
    }
}
 
/* When the app goes to the background, save the media url and time values
 to the application preferences. */
- (void)applicationDidEnterBackground:(UIApplication*)application
{
    if (self.playbackViewController)
    {
        NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
        NSURL* URL = [self.playbackViewController URL];
        
        if (URL)
        {
            NSTimeInterval time = CMTimeGetSeconds([[self.playbackViewController player] currentTime]);
            
            [defaults setURL:URL forKey:AVPlayerDemoContentURLUserDefaultsKey];
            [defaults setDouble:time forKey:AVPlayerDemoContentTimeUserDefaultsKey];
        }
        else
        {
            [defaults removeObjectForKey:AVPlayerDemoContentURLUserDefaultsKey];
            [defaults removeObjectForKey:AVPlayerDemoContentTimeUserDefaultsKey];
        }
        
        [defaults synchronize];
    }
}
 
#pragma mark -
#pragma mark AssetBrowser Delegate
 
- (void)didPickURL:(AVURLAsset *)urlAsset
{
    if (urlAsset)
    {
        if (!self.playbackViewController)
        {
            self->playbackViewController = [[AVPlayerDemoPlaybackViewController alloc] init];
        }
        
        [self.playbackViewController setURL:urlAsset.URL];
        
        [self.cachedAssetBrowser pushViewController:self.playbackViewController animated:YES];
    }
    else if (self.playbackViewController)
    {
        [self.playbackViewController setURL:nil];
    }
}
 
- (void)assetBrowser:(AssetBrowserController *)assetBrowser didChooseItem:(AssetBrowserItem *)assetBrowserItem
{
    AVURLAsset *asset = (AVURLAsset*)assetBrowserItem.asset;
    [self didPickURL:asset];
}
 
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    /* Don't show the navigation bar when displaying the assets browser view */
    if (viewController == self->tabBarController) {
        navigationController.navigationBarHidden = YES;
    }
    else
    {
        navigationController.navigationBarHidden = NO;        
    }
}
 
 
@end